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moreover; furthermore
nevertheless; and yet
「然も」 has another reading with different meanings.
彼は優秀で、しかも努力家だ。
He's talented, and moreover, hardworking.
然も彼は最後まで何も言わなかった。
Yet he said nothing.
その店は安い。しかも味もいい。
That restaurant is cheap. And the food is good, too.